I've just started coding in PHP and I have a question about using operators with null or empty values. I'm trying to perform calculations or comparisons on such values, but I'm not sure if it's even possible.
Here's the scenario: I have a form where users can enter values for different fields. However, not all fields are mandatory, so some might be left empty. In my code, I need to calculate or compare these values, but I'm not sure how to handle cases where they are null or empty.
For example, let's say I have two variables, $var1 and $var2. $var1 might have a numeric value of 5, and $var2 might be empty. I want to check if $var1 is greater than $var2 and display a message accordingly. However, I'm not sure if using operators like > or < would work in this case.
Can I use operators like > or < to perform calculations or comparisons on null or empty values in PHP? If so, how should I handle them in my code? Do I need to use any additional functions or techniques?
Any help or guidance would be greatly appreciated! Thanks in advance.